telemarketers and how can you get them to stop calling you. A former telemarketer is sharing her secret, the simple things you can did to get them to leave you alone. ABC's Rebecca Jarvis has our story. Reporter: It's all that too familiar nuisance on the other end of the show and even jerry seinfeld answered their calls. Give me your home number and I'll call you later. We're not allowed to do that. I guess you don't want people calling you at home. Reporter: This morning Erica Elson is speaking out sharing her secrets in the August issue of "Reader's digest" detailing what she used to say to keep callers on the line. If you say no three types to everything that they've said then they'll be like, okay, this person is just not having it. I will let them go. Reporter: So how do you stop those unwanted calls from getting through. She says cutting the cord is simple as long as you know what not to do. Tip one, don't just hang up. Ignoring a caller slapping down that phone midconversation will land your name right back on the call list. Tip two, don't engage the telemarketer in conversation, not even to explain why you're not interested. Any conversation opens the door to another sales pitch. And tip three, never tell them to call you back later. They will. Even if you say something like I'm in the middle of dinner, that means, oh, I shouldn't call you at 6:00 P.M. So I'll try them in the morning. Reporter: What should you do? Keep calm and say the magic phrase, please add my name to your do not call list and take it a step further and add your name to the national do not call registry. Once you're on the list it's illegal for companies to call you. There's a fine line between being rude and being too friendly. You just want to remain polite but not reveal personal information. You may not know their number but they certainly won't forget yours in the end. For "Good morning America," Rebecca Jarvis, ABC news, new York. It is, indeed, a fine line, don't be rude, right? If you're on the do not call list and still being contacted by telemarketers, we suggest you go to goodmorningamerica.com on Yahoo! And find out how to turn it off. We will help you, I promise. Very frustrating. It is. The timing is always impeccable. Right -- Right in dinner. If you engage them in dialogue, oh, it just goes on and on, definitive, no, no, no. The problem is our kids jump and answer the phone -- Mommy, it's for you.

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